An aircraft wing develops lift by creating a vacumn above the wing that literally lifts the wing and the aircraft up into the air. The ATR-72 which crashed in Sao Paulo Brazil seems to have a very small wing which means it has to be moving very fast through the air to develop enough lift to fly. 
At slow speeds it cannot lift the aircraft because the lift it generates at a low speed in too little to lift the aircraft. At normal speeds the aircraft flies fine and the smaller wing makes it more efficient but as the recent video of the ATR-72 in a flat spin shows the aircraft wasn[t going foreward fast enough and it was in a flat spin from which it couldn’t recover. HERE. and HERE. If the wing was rendered less efficient because of ice it could explain how the aircraft stalled then entered a fatal flat spin. Our hearts go out to all those involved in the fatal crash in Brazil
Views: 1
